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Superconductors

March 30, 2020

QUESTION:

What are superconductors?

ANSWER:

The materials whose resistivity is zero at very low temperature is called superconductors. Example: Mercury below 4K.

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The magnification produced by a convex lens is -5. What is understood by this value?

October 02, 2025

Magnification is -5: The negative magnification means the image is real and the absolute value(without negative sign) of magnification (5) indicates that the image is real and inverted.

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Why are Liquids heated from below?

September 01, 2019

A liquid in a vessel is heated due to the process of convection. In convection heat is transferred by the actual movement of heated particles in upward direction. As the liquid is heated from below its density decreases and hence it rises up and cold liquid settles down and heated. This process continues till whole liquid is heated.